Projectile.



No. 760,338; PATENTED MAY 17, 1904. B. L. KWIATKQWSKI. PROJBGTILE.

APPLIOATION FILED JULY 15, 1903.

K0 MODEL.

awwntoz wameam UNirnn STATES Patented May 1'7, 190%.

PATENT frricia.

PROJECTILE.

SPECIFICATION- forming part of Letters Patent NO. 760,338, dated May 17,1904:. p

I Application filed July 15,1903. Serial No. 165,570. (No model.)

To (l/ZZ whom; it nuty concern:

Be it known that I, EDWARD L. KwrA'rnowsin, a subject of the King ofPrussia, Emperor of Germany, (but having residedin the United Statesover one year last past and having declared my intention of becoming acitizen thereof,) residing in the city and county of Philadelphia, Stateof Pennsylvania, have invented new and useful Improvements in Pro.jectiles, of which the following is a specification.

My invention relates'to projectiles; and it consists in increasing theirinitial velocity, their speed of rotation, and their penetration.Trajectory is flattened, impact augmented, and glancing minimized.

It further consists of other-novel features of construction, all as willbe hereinafter fully set forth.

Figure 1 represents an elevation, partly sectional, of a cartridgeprovided with a bullet embodying my invention. Figs. 2 and 3 represent,respectively, a rear elevation and a perspective view of the bullet orprojectile detached.

Similar letters of reference indicate correponding parts in the figures.I

- Referring to the drawings, A designates a cartridge-shell, which maybe of the form required for any well-known or desired rifle or otherarm.

B designates a bullet of the usual conical form, having a planecylindric body C, at the rear of which is a butt D, in which are groovesE, which extend spirally in the direction of rotation from the body U tothe rear face of the bullet. In said base is a plurality of depressionsG, the bottom wall of each of which is sector-shaped and theoreticallysections of a screw of a desired pitch separated by crossbars G. Inpractice it may vary from this figure, with no material detraction fromits value. It will be noted that'the outer curved sides of depression 6'do not extend to the edge of the bullet or communicate with grodve E,these being circumscribed by a plane annulus H, which acts to protectthe gun-barrel from erosion, the bars G joining said annulus and servingto strengthen said annulus. The point K of the bullet'is provided with aplurality of helical grooves L, forming cutting edges M. I

The operation is as fol-lows: When the piece is fired, the cylindricbody C of the bullet B fills the bore and prevents any escape of gas. Atthe same time the bullet is rotated in the direction of the arrow shownin Fig. 1 by the gas pressure 0n the sides of the grooves E and on thefaces of the depressions Gr. It will be noted that the twist of thegrooves E is insuch a direction as to rotate the bullet from left toright, as usual. This rotation is assisted by the pressure against thefaces of the depressions G, escape ofsuch pressure directly against thesides of the gun-barrel being prevented by the circumscribing annulus H,which is strengthened by the intersect-' ing cross-bars G. In this Wayerosion of the barrel is greatly reduced.

When the bullet strikes, the cutting edges-M of the depressionsL beingfaced in the direction of rotation enable the bullet to engage with andbore into an object. Because of this boring action the bullet will notglance even at a considerable incidental angle.

My invention is applicable to projectiles made of any proper metal andof varying de.

grees of hardness.

Various changes may be made in the details of construction shownwithoutdeparting from the general spirit of my invention, and I do not,therefore, desire to be limited in each case to the same. i

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

l. A projectile comprising acylindric body adapted to fill the bore of agun and a butt portion having grooves which extend spirally in thedirection of rotation from said body to the rear face of the bullet.

2. A projectile comprising a cylindric body adapted to fill the bore ofa gun, a butt poraplane annulus inclosing'depressions, the bot- 2i planeannulus inclosing a plurality of detoms of which are inclined in thedirection of pressions separated by intersecting cross' 9 rotation.walls, the bottoms of said depressions being 3. A projectile comprisingacy'lindric body inclined in the direction of rotation.

adapted to fill the bore of a gun, a butt por- EDVVARI) L.KVVlA'lhOlVSKI.

tion having grooves which extend spirally in Witnesses:

the direction of rotation from said body to the. J OiiN A. \NHGDERSHEIM,

rear of the bullet and a rear face consisting of GEO. L. (looruii.

